data_rom_waveforms.html

来自「用FPGA设计12832中文液晶控制器,采用状态机的方式」· HTML 代码 · 共 14 行

HTML

14 行

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<title>Sample Waveforms for data_rom.vhd </title>
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<h2><CENTER>Sample behavioral waveforms for design file data_rom.vhd </CENTER></h2>
<P>The following waveforms show the behavior of altsyncram megafunction for the chosen set of parameters in design data_rom.vhd. For the purpose of this simulation, the contents of the memory at the start of the sample waveforms is assumed to be ( F0, F1, F2, F3, ...). The design data_rom.vhd has one read port. The read port has 32 words of 8 bits each. The output of the read port is registered by clock. </P>
<CENTER><img src=data_rom_wave0.jpg> </CENTER>
<P><CENTER><FONT size=2>Fig. 1 : Wave showing read operation. </CENTER></P>
<P><FONT size=3>The above waveform shows the behavior of the design under normal read conditions. The read happens at the rising edge of the enabled clock cycle. The output from the RAM is undefined until after the first rising edge of the read clock. </P>
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